Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece
and leave with the element ID LEGO asks for, or a link to buy the part.
3,712 pieces in 483 part and color combinations, plus 11 minifigures.
The official piece count includes the 44 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Plate 1 x 12Black ×6Dark Blue ×7Black is yellower and darker than Dark Blue.
Plate 1 x 2Black ×8Dark Blue ×55Black is yellower and darker than Dark Blue.
Plate 1 x 8Black ×3Dark Blue ×36Black is yellower and darker than Dark Blue.
Plate 2 x 4Black ×16Dark Blue ×33Black is yellower and darker than Dark Blue.
Tile 2 x 3Black ×1Dark Blue ×29Black is yellower and darker than Dark Blue.
Tile Special 1 x 2 Grille with Bottom GrooveBlack ×2Dark Blue ×32Black is yellower and darker than Dark Blue.
3 more look-alike pairs
Plate 1 x 8Black ×3Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Plate 2 x 4Black ×16Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Technic Pin Connector Round 1L [Beam]Black ×2Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Animal Body Part / Plant, Tail / Neck / Branch / Trunk, Middle Section with Pin, Square Pin HoleReddish BrownPart 51274Element 6326087×1
Animals / Creatures
1 piece
Animal, Squirrel, Standing, Black Eyes and Reddish Brown Nose PrintDark OrangePart 80679pr0001Element 6384077×1
Large Buildable Figures
1 piece
Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle HolesLight Bluish GrayPart 98585Element 6186129 or 6039505×1
Minifig Upper Body
1 piece
Arm Mechanical Straight (Droid) [2 Clips at 90°]BlackPart 59230Element 45057571 spare in the box×1
Stickers
1 piece
Sticker Sheet for Set 10303-1[No Color/Any Color]Part 10084111Element 6373899×1
Tools
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Windows and Doors
1 piece
Door Frame 1 x 6 x 6WhitePart 42205Element 6256127×1
Windscreens and Fuselage
1 piece
Windscreen 2 x 4 x 2 VerticalTrans-ClearPart 4594Element 6507908 or 6240532×1
Minifigures
11 figures
Dark Red Torso, Blue Legs, Black HairMinifigure, checked as a whole figure×1
Bright Light Blue Torso, White Legs, Dark Azure HairMinifigure, checked as a whole figure×1
White Torso, Dark Purple Legs, Dark Pink CapMinifigure, checked as a whole figure×1
Kid - Blue Torso, Medium Blue Legs, Tan HairMinifigure, checked as a whole figure×1
Medium Nougat Torso, Sand Green Legs, Dark Brown HairMinifigure, checked as a whole figure×1
Bright Light Blue Torso and Legs, Red HairMinifigure, checked as a whole figure×1
LEGO Employee, Yellow Torso, Blue Legs, Reddish BrownMinifigure, checked as a whole figure×1
Chef, White Torso, Dark Tan Legs, Red CapMinifigure, checked as a whole figure×1
Dark Green Torso, Dark Blue Legs, Medium Nougat HairMinifigure, checked as a whole figure×1
Bright Pink Torso, Tan Legs, Dark Bluish Grey HairMinifigure, checked as a whole figure×1
White/Dark Turquoise Torso, Light Bluish Grey Legs, Red Cap with Reddish Brown HairMinifigure, checked as a whole figure×1
Tick each piece as you find it, or mark it missing.
When a piece really is missing
Ask LEGO
LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for
the set number and each piece's element ID, the number printed beside the piece in the parts list at the back
of the instructions. This checker lists both.
Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from
older or second-hand sets.
Keep a record
Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick
pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.